Quote:
Originally Posted by Sven7
Maybe replacing an old cat or adding a new one?
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I think replacing the cat may be effective, because they do age, but the aging really depends on the engine history. I would want a tail-pipe emissions test before and after the exchange to verify that it worked, otherwise it's too much money to sink into something without knowing.
EDIT: BTW, if anyone does this with an older car, I would love to hear the results, positive or negative.